snowy owl

Snowy Owl
Conservation status
Least Concern (IUCN 3.1)[1]
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Aves
Order:	Strigiformes
Family:	Strigidae
Genus:	Bubo
Species:	B. scandiacus
Binomial name
Bubo scandiacus (Linnaeus, 1758)
Synonyms
Strix scandiaca Linnaeus, 1758 Nyctea scandiaca Stephens, 1826

The Snowy Owl (Bubo scandiacus) is a large owl of the typical owl family Strigidae. The Snowy Owl was first classified in 1758 by Carolus Linnaeus, the Swedish naturalist who developed binomial nomenclature to classify and organize plants and animals. The bird is also known in North America as the Arctic Owl or the Great White Owl. Until recently, it was regarded as the sole member of a distinct genus, as Nyctea scandiaca, but mtDNA cytochrome b sequence data (Olsen et al. 2002) shows that it is very closely related to the horned owls in the genus Bubo. The Snowy Owl is the official bird of Quebec.

Behaviour

Young owl on the tundra at Barrow Alaska

The Snowy Owl is typically found in the northern circumpolar region, where it makes its summer home north of latitude 60 degrees north. However, it is a particularly nomadic bird, and because population fluctuations in its prey species can force it to relocate, it has been known to breed at more southerly latitudes. During the last ice age, there was a Central European paleosubspecies of this bird, Bubo scandiacus gallicus, but no modern subspecies are recognized.

This species of owl nests on the ground, building a scrape on top of a mound or boulder. A site with good visibility, ready access to hunting areas, and a lack of snow is chosen. Gravel bars and abandoned eagle nests may be used. Breeding occurs in May, and depending on the amount of prey available, clutch sizes range from 5 to 14 eggs, which are laid singly, approximately every other day over the course of several days. Hatching takes place approximately five weeks after laying, and the pure white young are cared for by both parents. Both the male and the female defend the nest with their young from predators. Some individuals stay on the breeding grounds while others migrate.

Range

In Quebec

Snowy Owls winter south through Canada and northernmost Eurasia, with irruptions occurring further south in some years. They have been reported as far south as Texas, Georgia, the American Gulf states, southern Russia, northern China and even the Caribbean. Between 1967 and 1975, Snowy Owls bred on the remote island of Fetlar in the Shetland Isles north of Scotland, UK. Females summered as recently as 1993, but their status in the British Isles is now that of a rare winter visitor to Shetland, the Outer Hebrides and the Cairngorms.^[2] In January 2009, a Snowy Owl appeared in Spring Hill, Tennessee, the first reported sighting in the state since 1987.^[3]

Hunting and diet

This powerful bird relies primarily on lemmings and other rodents for food, but at times of low prey density, or during the ptarmigan nesting period, they may switch to juvenile ptarmigan. As opportunistic hunters, they feed on a wide variety of small mammals such as meadow voles and deer mice, but will take advantage of larger prey, frequently following traplines to find food. Some of the larger mammal prey includes hares, muskrats, marmots, squirrels, rabbits, prairie dogs, rats, moles, dogs, foxes and entrapped furbearers. Birds include ptarmigan, ducks, geese, shorebirds, ring-necked pheasants, grouse, American coots, grebes, gulls, songbirds, and short-eared owls. Snowy Owls are also known to eat fish and carrion. Most of the owls' hunting is done in the "sit and wait" style; prey may be captured on the ground, in the air or fish may be snatched off the surface of bodies of water using their sharp talons. Each bird must capture roughly 7 to 12 mice per day to meet its food requirement and can eat more than 1,600 lemmings per year.

Snowy Owls, like many other birds, swallow their small prey whole. Strong stomach juices digest the flesh and the indigestible bones, teeth, fur, and feathers are compacted into oval pellets that the bird regurgitates 18 to 24 hours after feeding. Regurgitation often takes place at regular perches, where dozens of pellets may be found. Biologists frequently examine these pellets to determine the quantity and types of prey the birds have eaten. When large prey are eaten in small pieces, pellets will not be produced.^[4]

Conservation

Though Snowy Owls have few predators, the adults are very watchful and well equipped to defend against any kind of threats towards them or their offspring. During the nesting season the owls regularly face arctic foxes and swift-flying jaegers as well as dogs, gray wolves and other avian predators. Humans are probably the most important predator of snowy owls. They must be very careful not to leave their eggs unattended. Males defend the nest by standing guard nearby while the female incubates the eggs and broods the young. Both sexes attack approaching predators, dive-bombing them and engaging in distraction displays to draw the predator away from the nest. They also compete directly for lemmings and other prey with several predators, including rough-legged hawks, golden eagles, peregrine falcons, gyrfalcons, jaegers, glaucous gulls, short-eared owls, common ravens, wolves, arctic foxes, and ermine. Some species, such the snow goose, nesting near snowy owl nests seem to benefit from the protection of snowy owls that drive competing predators out of the area.^[5]

Environmental conditions also cause local threats of food shortages, but their ability to be mobile permits them to move to areas where supplies may be more sufficient.

Human activities probably pose the greatest danger to these birds, through collisions with power lines, fences, automobiles, or other structures that impose on their natural habitat. Now, Canadian provincial and territorial regulations have introduced prohibitions on the killing of these birds in all parts of Canada, where they are most abundant, but the owls are still used for certain study programs.

This species is an extremely important component to the food web in the tundra ecosystem and during its visits to the south, the Snowy Owl may play a useful role in the natural control of rodents in agricultural regions.

In popular culture

• Steve (voiced by Jonathan Katz), the therapist who helps Carl the penguin (Bob Saget) with his love life in Farce of the Penguins is a Snowy owl.
• The O RLY? owl is a Snowy owl.
• In the 1994 film, Dumb and Dumber, Lloyd Christmas (Jim Carrey) accidentally kills an Icelandic Snowy Owl with the cork of a bottle by launching it. In the film, they are called "Snow Owls" and are considered critically endangered (unlike the real bird).
• The Snowy Owl is the official bird of Quebec.
• The Snowy Owl was depicted on the 1986 series Canadian $50 note [1].
• A Snowy White Owl named "Gamma" is the mascot of the fraternity Phi Gamma Delta.
• The Snowy Owl is a familiar in the popular online game, Kingdom of Loathing.
• In the Harry Potter series by J. K. Rowling, Harry's owl, Hedwig, is a Snowy Owl.
  • Although female, Hedwig is played by a male owl in the Harry Potter movies because males are more thoroughly white, lacking the barring of females.
• Queen Siv's servant Myrrthe from the "Guardians of Ga'Hoole" book series was a Snowy owl. So were Borron and Barran, Madame Plonk ,and The Rogue Smith of Silverveil.
• A Snowy owl is the logo of the cigar brand White Owl.
• The Inuit language word for the Snowy Owl is "ookpik", "okpik" or "ukpik"
  • Okpik, a cold-weather adventure program for the Boy Scouts of America
  • Abe Okpik, an Inuvialuit who was instrumental in helping Inuit obtain surnames
• The Snowy Owl is one of many animals featured in the 2002 game Impossible Creatures
• A Snowy Owl is featured prominently on the cover painting of Canadian rock band Rush's 1975 album Fly By Night. A live owl appears on the cover of Rush's 1981 live album Exit...Stage Left, referencing Fly By Night.
• A Snowy Owl features prominently on the coat of arms of former Governor General of Canada Jules Léger.
• Mozilla Labs' Snowl is represented by a Snowy Owl.

Further reading

Identification, ageing and sexing

• Hough, Julian (1992) Snowy Owl plumages Birding World 5(3):97-8

References

External links

Wikimedia Commons has media related to: Bubo scandiacus

• The Snowy Owl Bubo scandiacus - Information, Pictures and call
• Cancu Ota, and a tale of Owl and Raven
• Snowy Owl Information Sheet
• Free Online Video About Snowy Owls
• Snowy Owl Species Account - Cornell Lab of Ornithology
• Snowy Owl Information and Photos - South Dakota Birds and Birding
• Snowy Owl Bubo scandiacus - USGS Patuxent Bird Identification InfoCenter
• Stamps